• boolangery (24/24) Nov 16 2018 Hi,
• Steven Schveighoffer (15/43) Nov 16 2018 I'm not understanding what you are trying to do, but to answer your

boolangery <eliott.dumeix gmail.com> writes:

Hi,

Is something like this is doable ?

-------------------------------------------------------------------
// all compile time
MapperGen.Create!(A, B)
     .Map!("p1", "p2")
     .Map!("myprop", "otherprop")
     .Gen();

// The code above must generate something like
//
// class Mapper {
//     B map(A value) {
//         B ret = new B();
//         ret.p1 = value.p2;
//         ret.myprop = p2.otherprop;
//         return ret;
//     }
// }

// runtime use
auto b = new Mapper().map(new A());
-------------------------------------------------------------------

I can't figure out how to concatenate string at runtime and the 
mixin the resulting string?.


Thanks in advance !

Steven Schveighoffer <schveiguy gmail.com> writes:

On 11/16/18 12:10 PM, boolangery wrote:
 Hi,
 
 Is something like this is doable ?
 
 -------------------------------------------------------------------
 // all compile time
 MapperGen.Create!(A, B)
      .Map!("p1", "p2")
      .Map!("myprop", "otherprop")
      .Gen();
 
 // The code above must generate something like
 //
 // class Mapper {
 //     B map(A value) {
 //         B ret = new B();
 //         ret.p1 = value.p2;
 //         ret.myprop = p2.otherprop;
 //         return ret;
 //     }
 // }
 
 // runtime use
 auto b = new Mapper().map(new A());
 -------------------------------------------------------------------
 
 I can't figure out how to concatenate string at runtime and the mixin 
 the resulting string?.

I'm not understanding what you are trying to do, but to answer your 
question, you can only mixin a string generated at compile time.

However, you can concatenate a string at runtime inside a CTFE-able 
function, and then mixin the result.

Example:

string foo(string[] fields...)
{
    string result = "struct Foo {";
    foreach(f; fields)
        result ~= "int " ~ f ~ ";";
    return result ~ "}";
}

mixin(foo()); // generate the struct

-Steve